Khujamuratovna, Jabbarova Ikbol. “Contributions of Irrigators Yekaterina Isaakovna Friesen and Somova Nina Nikolaevna to the Development of Kashkadarya Water Management”. Miasto Przyszłości 30 (December 5, 2022): 18–20. Accessed June 27, 2025. https://miastoprzyszlosci.com.pl/index.php/mp/article/view/823.